# -*- mode: makefile -*-
#
# Copyright (c) 2012, Joyent, Inc. All rights reserved.
#
# Makefile.targ: common targets.
#
# NOTE: This makefile comes from the "eng" repo. It's designed to be dropped
# into other repos as-is without requiring any modifications. If you find
# yourself changing this file, you should instead update the original copy in
# eng.git and then update your repo to use the new version.
#
# This Makefile defines several useful targets and rules. You can use it by
# including it from a Makefile that specifies some of the variables below.
#
# Targets defined in this Makefile:
#
#	check	Checks JavaScript files for lint and style
#		Checks bash scripts for syntax
#		Checks SMF manifests for validity against the SMF DTD
#
#	clean	Removes built files
#
#	docs	Builds restdown documentation in docs/
#
#	prepush	Depends on "check" and "test"
#
#	test	Does nothing (you should override this)
#
#	xref	Generates cscope (source cross-reference index)
#
# For details on what these targets are supposed to do, see the Joyent
# Engineering Guide.
#
# To make use of these targets, you'll need to set some of these variables. Any
# variables left unset will simply not be used.
#
#	BASH_FILES	Bash scripts to check for syntax
#			(paths relative to top-level Makefile)
#
#	CLEAN_FILES	Files to remove as part of the "clean" target.  Note
#			that files generated by targets in this Makefile are
#			automatically included in CLEAN_FILES.  These include
#			restdown-generated HTML and JSON files.
#
#	DOC_FILES	Restdown (documentation source) files. These are
#			assumed to be contained in "docs/", and must NOT
#			contain the "docs/" prefix.
##
# You can also override these variables:
#
#	BASH		Path to bash (default: bash)
#
#	CSCOPE_DIRS	Directories to search for source files for the cscope
#			index. (default: ".")
#

#
# Defaults for the various tools we use.
#
BASH		?= bash
BASHSTYLE	?= tools/bashstyle
CP		?= cp
CSCOPE		?= cscope
CSCOPE_DIRS	?= .
MKDIR		?= mkdir -p
MV		?= mv
RESTDOWN_FLAGS	?= -b docs/branding
RMTREE		?= rm -rf

ifeq ($(shell uname -s),SunOS)
	TAR	?= gtar
else
	TAR	?= tar
endif


#
# Defaults for other fixed values.
#
BUILD		= build
DISTCLEAN_FILES += $(BUILD)
DOC_BUILD	= $(BUILD)/docs/public


#
# Targets. For descriptions on what these are supposed to do, see the
# Joyent Engineering Guide.
#

#
# Instruct make to keep around temporary files. We have rules below that
# automatically update git submodules as needed, but they employ a deps/*/.git
# temporary file. Without this directive, make tries to remove these .git
# directories after the build has completed.
#
.SECONDARY: $($(wildcard deps/*):%=%/.git)

#
# This rule enables other rules that use files from a git submodule to have
# those files depend on deps/module/.git and have "make" automatically check
# out the submodule as needed.
#
deps/%/.git:
	git submodule update --init deps/$*

#
# These recipes make heavy use of dynamically-created phony targets. The parent
# Makefile defines a list of input files like BASH_FILES. We then say that each
# of these files depends on a fake target called filename.bashchk, and then we
# define a pattern rule for those targets that runs bash in check-syntax-only
# mode. This mechanism has the nice properties that if you specify zero files,
# the rule becomes a noop (unlike a single rule to check all bash files, which
# would invoke bash with zero files), and you can check individual files from
# the command line with "make filename.bashchk".
#
.PHONY: check-bash
check-bash: $(BASH_FILES:%=%.bashchk) $(BASH_FILES:%=%.bashstyle)

%.bashchk: %
	$(BASH) -n $^

%.bashstyle: %
	$(BASHSTYLE) $^

.PHONY: check-eslint
check-eslint::
	$(ESLINT) $(JS_FILES)

.PHONY: check-lint
check-lint::
	@(echo 'Running "make check-lint"'; NO_STYLE=true $(ESLINT) $(JS_FILES))

.PHONY: check-style
check-style::
	 @(echo 'Running "make check-style"'; NO_LINT=true $(ESLINT) $(JS_FILES) || (echo 'Run "make fix-style" to auto-fix styling issues'; exit 1))

.PHONY: fix-style
fix-style::
	$(PRETTIER) --write "**/*.js"

.PHONY: check
check: check-lint check-style check-bash
	@echo check ok

.PHONY: clean
clean::
	-$(RMTREE) $(CLEAN_FILES)

.PHONY: distclean
distclean:: clean
	-$(RMTREE) $(DISTCLEAN_FILES)

CSCOPE_FILES = cscope.in.out cscope.out cscope.po.out
CLEAN_FILES += $(CSCOPE_FILES)

.PHONY: xref
xref: cscope.files
	$(CSCOPE) -bqR

.PHONY: cscope.files
cscope.files:
	find $(CSCOPE_DIRS) -name '*.c' -o -name '*.h' -o -name '*.cc' \
	    -o -name '*.js' -o -name '*.s' -o -name '*.cpp' > $@

#
# The "docs" target is complicated because we do several things here:
#
#    (1) Use restdown to build HTML and JSON files from each of DOC_FILES.
#
#    (2) Copy these files into $(DOC_BUILD) (build/docs/public), which
#        functions as a complete copy of the documentation that could be
#        mirrored or served over HTTP.
#
#    (3) Then copy any directories and media from docs/media into
#        $(DOC_BUILD)/media. This allows projects to include their own media,
#        including files that will override same-named files provided by
#        restdown.
#
# Step (3) is the surprisingly complex part: in order to do this, we need to
# identify the subdirectories in docs/media, recreate them in
# $(DOC_BUILD)/media, then do the same with the files.
#
DOC_MEDIA_DIRS := $(shell find docs/media -type d 2>/dev/null | grep -v "^docs/media$$")
DOC_MEDIA_DIRS := $(DOC_MEDIA_DIRS:docs/media/%=%)
DOC_MEDIA_DIRS_BUILD := $(DOC_MEDIA_DIRS:%=$(DOC_BUILD)/media/%)

DOC_MEDIA_FILES := $(shell find docs/media -type f 2>/dev/null)
DOC_MEDIA_FILES := $(DOC_MEDIA_FILES:docs/media/%=%)
DOC_MEDIA_FILES_BUILD := $(DOC_MEDIA_FILES:%=$(DOC_BUILD)/media/%)

#
# Like the other targets, "docs" just depends on the final files we want to
# create in $(DOC_BUILD), leveraging other targets and recipes to define how
# to get there.
#
.PHONY: docs
docs:							\
    $(DOC_FILES:%.restdown=$(DOC_BUILD)/%.html)		\
    $(DOC_FILES:%.restdown=$(DOC_BUILD)/%.json)		\
    $(DOC_MEDIA_FILES_BUILD)

#
# We keep the intermediate files so that the next build can see whether the
# files in DOC_BUILD are up to date.
#
.PRECIOUS:					\
    $(DOC_FILES:%.restdown=docs/%.html)		\
    $(DOC_FILES:%.restdown=docs/%json)

#
# We do clean those intermediate files, as well as all of DOC_BUILD.
#
CLEAN_FILES +=					\
    $(DOC_BUILD)				\
    $(DOC_FILES:%.restdown=docs/%.html)		\
    $(DOC_FILES:%.restdown=docs/%.json)

#
# Before installing the files, we must make sure the directories exist. The |
# syntax tells make that the dependency need only exist, not be up to date.
# Otherwise, it might try to rebuild spuriously because the directory itself
# appears out of date.
#
$(DOC_MEDIA_FILES_BUILD): | $(DOC_MEDIA_DIRS_BUILD)

$(DOC_BUILD)/%: docs/% | $(DOC_BUILD)
	$(CP) $< $@

docs/%.json docs/%.html: docs/%.restdown | $(DOC_BUILD) $(RESTDOWN_EXEC)
	$(RESTDOWN) $(RESTDOWN_FLAGS) -m $(DOC_BUILD) $<

$(DOC_BUILD):
	$(MKDIR) $@

$(DOC_MEDIA_DIRS_BUILD):
	$(MKDIR) $@

#
# The default "test" target does nothing. This should usually be overridden by
# the parent Makefile. It's included here so we can define "prepush" without
# requiring the repo to define "test".
#
.PHONY: test
test:

.PHONY: prepush
prepush: check test
